Aristotle (384-322BC) - Began much of what we call biology today. Mostly wrong conclusions but asked GREAT questions.

Anton van Leeuwenhoek (1632-1723) - First to see the "New World" of microscopic life.

Rudlof Virchow (1821-1902) said "Omnis cellula e cellula."

Gregor Johann Mendel - Abbott and Pea Plant breeder. Father of Genetics. 1866 and 1900 key dates.

Charles Darwin (1809-1882) Father of Evolution by Natural Selection shortly before his death.

Alfred Russel Wallace (1823-1913) - Wrote the 1st paper,with Darwin, identifying Natural Selection as the mechanism of evolutionay change.

Louis Pasteur (1822-1895) - Great biologist in numerous areas

Oswald Avery - Round #2 fighter in Protein vs Nucleic Acid

Martha Chase and Alfred Hershey in 1953. The winners of Round #3 Nucleic Acid vs. Protein!

Rosalind Franklin (1920-1958) - Helped Watson & Crick significantly with the discovery of the structure of DNA.

James Watson and Francis Crick - Discover the structure of DNA in 1953

Here are the 20 naturally occuring Amino Acids!! The 20 Letters of the protein alphabet.

Ellen's Cell - 2005

Katherine's Cell - 2005

Alexa's Cell - 2004

Asha's Cell - 2004

Lauren's Cell - 2004

Julia's Cell - 2004

Typical Animal Cell - Note the size of the nucleus.

Onion cells as seen with a light microscope

Elodea - Typical plant cells as seen with the light microscope.

Elodea cells undergoing plasmolysis. What could cause this change int he cells?

Human cells from mouth as seen through a light microscope.

The unicellular "Blob"

The most advanced single celled organism.

Cell Membrane at the molecular level

Mitochondria - The powerhouse of the cell.

Osmosis: The effects of water movement on a cell.

Neuron - A single nerve cell.

Human Blood Cells - Normal

Human Blood Cells with Sickle Cell Anemia.

Mitosis in Animal Cell

Mitosis in Plant Cells - Onion Root - Note the labelled phases!

Mitosis in Plant Cells - Onion Root scan #1

Mitosis in Plant Cells - Onion Root Cells scan #2

Mitosis in Plant Cells - Onion Root Cells scan #3

Mitosis in Plant Cells - Onion Root Cells scan #4

Mitosis - Plant Cell Telophase. Note the new cell plate forming inthe mid-cell.

Mitosis in Animal Cells (White Fish) - Unknown Stage "A"

Mitosis in Animal Cells (White Fish) - Unknown Stage "B"

Mitosis in Animal Cells (White Fish) - Unknown Stage "C"

Mitosis in Animal Cells (White Fish) - Unknown Stage "D"

Zygote - The first cell of a new organism. Note the sperm and egg nuclui about to fuse.

Metaphase Smear that will be cut up to make a Karyotype

Finished Karyotype - Pairs of chromosomes arranged by size, centromere positin and banding patterns.

Albinos have double reccessive genes for pigmentation.

Two Human Genetic Traits and a pedigree for each

Fruit Flies: Female on the left and male on the right. Note size and banding differences of the abdomen.

Pedigree of Queen Victoria and her descendants tracing the gene for Hemophilia.

Hairy Ears - Trait is carried on the "Y" chromosome so only males have this variation. Traits on the "Y" are called "Holandric."

DNA - The Double Helix

The molecular structure of DNA. Note the double helix shape.

DNA in the process of replication

DNA Replication a second version.

Codon Chart - The genetic code of life

Control points for DNA to enzyme in Eukaryotic Cells

Comparison of Transcription &Translation in Eukaryotic and Prokaryotic cells.

Gel Electrophoresis separation technique

Scale of Relative Sizes

Respiration - Anaerobic Pathway

Respiration - Aerobic Pathway

Respiration - Aerobic Pathway (a second version)

The members of the electromagnetic spectrum arranged by wavelength

Absorption Spectrum of Chlorophyll

Absorption Spectrum of Chlorophyll #2

Absorption Spectrum of Leaf Pigments

Separation of pigments from a leaf using paper chromatography

Cross section view of a real leaf - Privit species

Note the parts of a leaf in this cross section view.

Leaf Structure Comparison - C3 vs C4

Web - Showing trophic levels. The arrows show the flow of energy and the movement of matter from one organism to the next.

Web - Showing typical interactions in a forest community. Note the direction of the arrows!

Bay Web - Organisms interacting in eating relationships.

Vole (Meadow Mouse) - common prey of Owls as seen in Owl Pellets.

A close-up of the large, sharp teeth of the 3 1/2 -pound red-bellied piranha caught in Stansbury Pond, Maryland. Sun Photo by Jed Kirschbaum 9/26/06

A non-native fish species in Maryland.

Tapeworm - An endoparasite; the head end.

Tapeworm - Endoparasite removed from the body of its host.

Wooly Mammoth - Why are the ears so small?

African Elephant - Note the size of those ears; why so big?

Fungus (on the right) grown by Phase 5 Table 4 biology group may 2005

Graph of the activity of these two important human digestive enzymes.

Identify the numberd parts and tell me their function.

Electrophoresis eaquipment: Notice the flow is toward the positive pole.

Electrophoresis the process.

Electrophoresis - the result: a DNA Fingerprint. Who is guilty?